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The typical use case for remoting events is in scenarios where different applica tions are running, applications that reference each other and are running on the same machine. Because events are only useful when listeners are wired up to respond to them, scalability is seriously decreased as the number of listeners increases. This limi tation means that an application that performs well with, for instance, 10 clients might come to a crashing halt when 30 clients are added. Due to the number of different variables that can affect this, it s next to impossible to determine the breaking point in advance. If you know an application will be distributed to mul tiple clients, using events is ill-advised. Listening to events involves a server component being coupled with a client component and vice versa. This arrangement makes the application very suscep tible to failures outside of the application. The only responsible way to address this is through complex and sophisticated exception handling. This exception handling greatly complicates the code and makes maintenance much more dif ficult. Any point on the network might fail (such as the switch, the server, or the net work card); however, the client is not necessarily notified of this failure. If the cli ent application makes infrequent calls to the server this failure can be particularly problematic. The client application might be expecting notifications for events, yet the server is no longer responding. The latency between the server failure and client notification can be very troublesome. There are solutions, such as polling, but these all entail an additional layer of complexity that greatly com plicates the code logic and makes maintenance much more difficult.

Items that need to be accessed from outside an organization s boundaries and common dependencies are listed in Table 3-1. Some of these resources might also have a depen dency on the location of a certificate revocation list (CRL). Figure 3-1 shows this interdependency of services.

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The key HKCU\Control Panel has a wealth of customization possibilities. This is the key where Windows XP stores most of the settings you configure in Control Panel. The most interesting subkeys are Desktop and Mouse. The following list gives you an overview of what's in most of the subkeys, and I describe the Desktop and Mouse subkeys in more detail in the sections following this one: Accessibility. This subkey stores accessibility settings you set using the Accessibility Options dialog box. To open this dialog box, click Start, Control Panel, Accessibility Options. The values' names are self explanatory, and you can easily map them to the user interface. Appearance. This subkey contains values for each scheme you see on the Appearance tab of the Display Properties dialog box. To open this dialog box, click Start, Control Panel, Appearance And Themes, Display. Customizing themes in the registry is too cumbersome to do reliably, so stick with the user interface. Colors. This subkey defines the color of each element in the Windows XP user interface. ActiveBorder defines the color of each active window's border, for instance. Each value is a REG_SZ value that contains three decimal numbers that correspond to the RGB color notation. Current. Windows XP does not use this subkey. Cursors. This subkey contains values that associate the name of a mouse pointer with a file containing the mouse pointer. The file has the .cur extension, or if the pointer is animated, the .ani extension. The value's name is the name of the pointer. This key's default value contains the name of the current pointer scheme. You don't see values in this key unless you've customized your pointers in the Mouse Pointers dialog box. To open the Mouse Pointers dialog box, click Start, Control Panel, Printers And Other Hardware, Mouse.

If the OneWay attribute is used, the client is not notified of any failures on the server. With events, these calls might be frequent and each time an event is raised, the server tries to contact each of the listening machines. If these machines are no longer running, the server tries to contact them nonetheless. These attempts can cause a huge resource leakage. Code Access Security does not work across process boundaries. This limitation raises many security concerns that are often rather difficult to properly address.

Figure 3-1 Discovering service interdependencies Table 3-1

After this lesson, you will be able to:

Dependencies Active Directory, therefore domain controller and Global Catalog (GC) server. Possibly SQL database, application servers, domain controller

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